Methylethylene

Synonyms BRN 1731096 EINECS 211-720-1 Isobutylethylene l-lsopropyl-2-methylethene 1-Isopropyl-2-methylethylene 4-Methyl-l-amylene 4-Methyl-l-pentylene NSC 15091 UN 1993. 

Formerly, the stmcture-based name, poly[oxy(l-methylethylene)], would have heen acceptable for this molecule but longer is (see page 257 for an explanation of traditional names, strueture-based names and source-based names of polymers). 

The repeat unit (III) in polypropylene oxide) [IUPAC poly(oxy[l-methylethylene])], on the other hand, possesses stereocenters that are chirotopic since the two chain segements... 

The method of photosensitized oxygenation was successfully applied in the preparation of alcohols 265-270 from sylvestrene (264),207 and seems to be the most simple and successful method for the preparation of optically active rose oxides (272,273) from (+)- or (—)-citronellol C271).177 It may also be used for the preparation of certain organo-metallic hydroperoxides. Thus, the triphenyl-tin derivative of tri-methylethylene (274) undergoes a photosensitized oxygenation reaction with a rate similar to that of tetramethylethylene, giving rise to the hydroperoxides 275 and 276 219... 

If cyclopropane may be thermochemically compared with ethylene, then methylcyclo-propane may likewise be compared with propene. In the same way, the isomeric 1,1-, cis-1,2- and turns-1,2-dimcthylcyclopropanc 21a, 21b, 21c with X = Me) are relatable in turn to the isomeric dimethylethylenes isobutylene, (Z)- and ( )-2-butene. But what is meant by thermochemically compared We start with the observation that cyclopropane and ethylene have fortuitously nearly identical gas-phase enthalpies of formation, (53.3 0.6) and (52.5 0.4) kJmol1. Can we then conclude that gas-phase methylcyclopropane and propene (methylethylene) have nearly the same enthalpy offormation, and that the former is higher than the latter by (0.8 0.7) kJmol-1 In fact, methylcyclopropane has a higher enthalpy of formation23 than propene by 24.3 [20.0 ( 0.8)] = [4.3 ( >0.8)] kJmoT1. The two differences, [0.8 ( 0.7)] and [4.3 ( >0.8)] kJmol1, are hardly the same. 

N,N-Dimethylethanolamine, AD50 N,N-Dimethylethylamine, ADA9 N,N-D methylethylened amine, AD58... 

Phenyl azide undergoes stereospecific addition to (Z)- and ( )-methyl-styrene as shown in Scheme 28.2 7,144 Although the reaction is sensitive to steric effects, as evidenced by the failure of phenyl azide to add to tetra-methylethylene,40 the orientation is controlled by electronic rather than steric factors.27,34,40... 

The dithionitronium cation SNS+ (as the AsFg salt) underwent quantitative concerted symmetry-allowed cycloaddition reactions with alkenes (ethylene, methylethylene, trans- and +r-l,2-dimethylethylene, 1,1-dimethyl-ethylene, tetramethylethylene, and norbornene) to give 1,3,2-dithiazolidine cations 76 (Equation 20) <1996JCD1997>. 

The photoreactions of 3-ethoxyisoindolenone with 1,1-dimethoxyethene, tetra-methylethylene, and cts-2-butene in methylene chloride solvent were chosen for quantum yield studies50, s9 With 0.06 M 1,1-dimethoxyethene the quantum yield of cycloadduct formation is 0.72, and with 0.06 M tetramethylethylene the total quantum yield of adduct formation is 0.59. Over the concentration range 0.06—2.00 M, the quantum yields of product formation from addition to 1,1-dimethoxyethene and tetramethylethylene are inversely related to the olefin concentration. Plots of reciprocal of quantum yield of product formation vs. reciprocal of olefin concentration one non-linear however, plots of reciprocal of quantum yield vs. olefin concentration are linear with slopes and intercepts as shown in Table 5. For photoaddition of 3-ethoxyisoindolenone to tetramethylethylene and c/s-2-butene, the product ratios (56 57 58 and 59 60 61 62) are independent of olefin concentra-... 

Union of Pure and Applied Chemists (IUPAC) has developed systematic nomenclature rules for polymers. As is the case with many small-molecule organic compounds, the IUPAC names are often complex and cumbersome. Therefore, polymer scientists often use common or abbreviated names, sometimes even product names. Poly[l- methoxycarbonyl)-l-methylethylene] (IUPAC) is almost always referred to as poly(methyl methacrylate), or PMMA, or even Lucite. IUPAC discourages the use of trademarked names, however unless it is importanfto refer to a specific commercial product. The IUPAC Macromolecular Nomenclature Commission recognizes a number of trivial names for common polymers (Metanomski 1999). 

In 1935, Michael and Carlson [5] reported that with fuming nitric acid tri-methylethylene gave crystalline 3-nitro-2-methyl-2-butylene in 20% yield ... 

SYNS METHYLETHENE METHYLETHYLENE D NCI-C50077 1-PROPENE PROPYLENE pOT, ACGIH)... 

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